Abstract
TiAlN and AlCrN coatings were deposited on mild steel (EN 353 steel) by cathodic arc evaporation technique. Coefficients of friction, critical load, adhesive and cohesive properties of these coatings were studied using scratch tester. Failure mode for coatings with thickness of 2 and 4 μm were studied using scratch channels and acoustic activities as basis. Studies presented relationship between progressive and in situ emission signals. AlCrN coating exhibited higher critical load as determined by the acoustic emission signal. Additionally wear mechanisms were analyzed. Analysis of the experimental results showed that load carrying capacity of AlCrN coating is better than TiAlN coating. Scratch wear test of AlCrN coated substrates showed reduction in cracking and spalling of coated layers.
Highlights
For variety of applications, improved tribological properties has become an important aspect in the development of high performance materials [1]
The TiAlN and aluminium chromium nitride (AlCrN) coatings were produced on EN-353 steel using cathodic arc evaporation method
The compound hardness of both coatings increased with increase in coating thickness
Summary
For variety of applications, improved tribological properties has become an important aspect in the development of high performance materials [1] In this direction, coatings are widely used to reduce the coefficient of friction as well as wear loss in all types of sliding contacts. Low coefficient of friction, high wear resistance and good oxidation resistance makes titanium nitride (TiN) an industrially popular coating. These properties make this an ideal candidate material for various tribological applications. For hard substrates are relatively brittle like ceramics, the hard coating materials are TiN, AlTiN and AlCrN films They have a great tendency to fracture and spall from the substrate during wear. Studies on aluminium titanium nitride (AlTiN) and aluminium chromium nitride (AlCrN) coatings have been increased [14,15,16]
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